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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '51f164bf5360c2f5273dd1c194f411118a3fdeb8dfabdcdb977b934425d5b7cf' 
  AND token = 'uCbC7kzRSJBCd3q3ZpS7RJE+X9tbjdgvfKHqucSRSNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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