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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '984a5d31133808e071d3cb7f50aef6ea4a098c8304cf6dcdbabbc33067faef2f' 
  AND token = 'Vu3Mv6YYGgEIASKXAvRcuDGZG5E+IMTlMlMAevIOzak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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