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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dbead349dbe7743304c6b748c4b1ffb6d8fd440a145f3fed61d497867881c9e0' 
  AND token = '7YxdrXqAp+Iqr1SyKNnQ7PvUwwS6hXJrRyPQA084dP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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