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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '73734dc920d3fca81eda4d03013585003a5cadde80c6b7a0da183ebacd7b92db' 
  AND token = 'NBpVoEjgq/LzEm/9KPc5+jD8vb0VwSyc6PVec+IQCHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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