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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0995ae49e7cd59f313bc440428bf85a54d9330c63fc186f32364eb72359845e5' 
  AND token = 'mSa67WhBQGhDh4oYEQKBl/468E5QNF+n1GwIs2/bGOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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