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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7930b142e4090860ea02bb728c92dcfe7224dee036a5ca940e93d34adbe48860' 
  AND token = '/VCuD18S1skqtR7vadh/O8Hi5BmOOiJ50fa9rribe8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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