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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c8a2a65ded4996704db307a3ccc8245ffc06303aed4ee0754b827d60d2b7bbee' 
  AND token = 'L/eEtP5kTFTUBlRTZ45rPgRYkePHfyF6fkUP1OmTDgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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