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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07a846c93f22f230c058d4c1577eaf5e5bbaa0053b5a0243032f6483f23fa3a1' 
  AND token = 'Gf3n5AjfOjeYv/o3VpB8dyctOZqOp3Gxlqrn4x4+zOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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