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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5232a2e72327fb8272f1606c4aedec05da2991078e3c6b78a055edc78b7f4b19' 
  AND token = 'JhdJG2MXLXZthLts6Vg939dBJkIok6w0Mxqh46MpdIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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