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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e0865f124cf73eee5d2cce3f85a528e140f285227ad43d5d4a7a69c65818f4d' 
  AND token = 'ftjG5AcVtr/6USLVNy0HP3+QvnF04I/uB/V31IOdgIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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