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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b806dad4d62d68b69eaba26343ad2d0fd5d19902360515c36a0812d4a191962' 
  AND token = 'TH6o0RyeOPfxjm3rBYLRb5+ebmm3hcpkH+UDvJHPByA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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