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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c848df8845ea073683c1eac283d5c49ffc6ebfda0a64fcb2f3ae7ec1db96f6dd' 
  AND token = 'bnryriaefLHri3x3YgkzlhRkbwopjEVitqDf8tFFR+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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