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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7afac49e4c7477094fecbf973e8156c0a74625af97a9805f59feb0003f734231' 
  AND token = 'v4ww6l0MyRDPqMSSOvWtH4FNpjRkRnoTQC9J3bRh+2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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