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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '416a6279050d8b37d85fd882849e0e67b188755dc4b1bdadc5bc701fce559a76' 
  AND token = 'SryG1adWK1vu3LSxDe1t6pwBPR42WTeR+3RlxrkNm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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