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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9bf42093e0c854b2179b50c98efb5e6453be68d4aec304dcd3e00610b591a4a7' 
  AND token = 'JPvXhL4NqffCZOJT3GyRRgKbemOr1M95LSX60ZeiRxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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