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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ec08d97c9ec51069657e23f5b98f1914b70190da71999f0830d89f97175de294' 
  AND token = 'qF2x5qRZ2eIpduWdJx9QgtYCnAY0z+djGnHew/2EVfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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