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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7116784fa6fb8f799dac726ad3208a4a5a4fec4c12ea62ad134cef335bd559a9' 
  AND token = '1/SfuHnTBo8yuMk7iyKKYc9VMp07AdiE0BJOWa0K9tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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