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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cca333e86c579a5fc1c8376081f18dddd5edea79c9d9a24f8e7d535e35655df' 
  AND token = 'gI7unyXJJvCg4lAB1EdDEkyfu213SpuI5V4kWaG6jbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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