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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06f1f6aa801aad5cd9b068c5cd8fd0938b61ed7bdda6c2daef6f88cdca74a520' 
  AND token = 'pTMJAl+40HsyRizvumfXRnEYnbX3pm9BsNHGrnafSww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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