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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c59b9ea8fbae53fead1a98ea11a92669a5a48cf9cf57372f576a22a0b6e35c9' 
  AND token = 'sO66U9BANwJrZ45SFhId1NwwU8TtZ4RUKl9uXlfOIX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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