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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f3a88898c519aa663c21ca48f2e4e0dd7b1e268d9f8e0c2c77badb198ed2eb4' 
  AND token = 't7VdOTyy4jVB/LW1iRMwxdUD6yACDunIqcaKJx2AB2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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