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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac886b978f8b761849ca14cdcc1862da9af2c6b41f0a5b7016b23e1e587dbd59' 
  AND token = 'X+hlerzsJ6NdtT05F26D6wc7z2cv/07JRvM18tBrVpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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