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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dc107db907a1304d747e285843386c2a15261336f99c3e65df9f6fabf61c063' 
  AND token = 'ZcYT3PwnfMtm3tPXxdU9Tt/kY0WNdV1wA2GbQEVA/U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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