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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '506a884a979459ee9f9e593758d83bbf4bf80c98062fe4785ad15a0e527b7f9f' 
  AND token = 'fNA71LO+aXomRz4aGOgkxDAEhzrSw8EsdU375Ttf2FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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