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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '09d2b172aa16787596104d3a59268e01c875e8328cf5b66ab4198e054aeab017' 
  AND token = 'iXycPS00NTWnWkYy1ilS2Zx/Yf04JdDtLkXt/gQsOXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}