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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b1bb7acbb02545bf9565d7f659ddd9e0fb0dedf712e57a284eef393fd189d4ce' 
  AND token = 'YG9L/gXOpQNV5Yn0LZ9UiSIa4bfzWqsUL8f3g3i9PYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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