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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b161e4d76cbe6202a2ee7a42452b4c9d6da4f56aae2b8e934f8dfb1a2b5d96a' 
  AND token = 'CdIMWYRbTE3SreTUpCCrpXMRDYJdSQJCZa/8xYV603k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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