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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea67c4ec03653f2c2cf1dc83b6f0eb336dadcc8d9364d97413b8664082ec05d4' 
  AND token = 'ccjmG4uGAO8gFb1nvRCGmsY57r4oAVEBZ4mL5l5HcKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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