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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '83d6528bec2aa7cd54e8d0b418e2df9f48882171389289cc908402edf845d083' 
  AND token = 'lsEm1YZy4dAw/H4sqAed/lHme/AlSUqZNBUsI2imI5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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