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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'efd5d11d61629776f391b67f29bb09ce5204c04eedd37a8309fe7e75899ecc75' 
  AND token = 'CXolltC0A0WtuM7lvNUJEnrCftAMdWaAre69undtqsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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