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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38c9fe8a98e09284487b0d9c15c14ece2d6a024104e6a54a09d5d817784526ca' 
  AND token = '+AA6ath4Ny4dxVpOztK9hll01b0+nN6KRJJ0cipd0lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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