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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8465b28ebc0c872ecb4b52043bf87b3eb15263e2e1ed309424ed8d533ee5b2a5' 
  AND token = '/1yJ2ah2R5lBlMtE9/8+I6OGONkrf0MJzstV2c7UoyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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